Abrasive device



Aug 13, 1929. F. o. ALBERTSON ET'AL 1,724,742

ABRASIVE DEVICE Filed G' 1927 5 Sheets-Sheet 1 MIME Aug. 13, 1929. F. o. ALBERTSON ET AL ABRQSIVE DEVICE 3 Sheets-Sheet 2 Filed Aug. 11, 1927 Wm hm Y K R om \\\\\\\\\\\\\\\v\ NV w. team 7 A -W mm mm ow W mm w mu w. ma m. @N wwws Q) Pl liu vmm I -GuAm'/v OM87!) Frans 0.a6bQTB Patented Aug. 13, 1929.

UNITED STATES PATEN T OFFICE.

DEANS O. ALBEBTSOH AND GUSTAV OLSEN, OF SIOUX CITY, IOWA, ASSIGNORS T ALBEB'I'SON & COMPANY, 01 SIOUX CITY,, I OWA; A CORPORATION OF IOWA.

annasrvn nn'vic'a.

Application filed August 11 1927. Serial No. 212,340.

The present invention, relates to abrasive devices and is with abrasive disks and means for 1ng)the same for rotation.

ne of the objects of our invention is the rovision of a relatively flat abrasive memer provided with a simple and effective means of supporting the same for rotation which may be conveniently removed and re- 1 ltaced with a minimum loss of time and a or.

Another object of our invention is the provision of an abrasive disk having means on its rear side for removably supporting the 1 same, comprising a plurality of rearwardly projecting tabs secured on said disks and adapted to be received in aslottedsupporting wheel and clamped therein to secure the disk ,for rotation.

Another object of our invention is the provision of a durable and. economical abrasive disk support comprising an annular felt pad carried by a stamped metal disk or wheel having a cup shaped center flush with the supportsurface of said pad and slotted to receive the supporting tabs of an abrasive disk, which tabs are clamped in said cup by a clamping member threaded on the hub of said stamped wheel. 7

' Another object is to provide a means for mounting an abrasive disk on a rotatable support whereby the disk can be quickly removed from the support without removing the support and whereby the rotation of the support helps to keep the disk in fixed position on said support.

Other objects and advantages of our invention will appear more fully from the following description and from the accompanying drawings in which similar characters of reference indicate similar parts throughout the several views.

Referring to the drawings Fig. l is a rear elevational View of one modification of the supporting wheel with the clamping member removed.

Fig. 2 is an exploded view of the ele ments which comprise the supporting Wheel and abrasive dis Fig. 3 is a medial cross-sectional view of the abrasive" disk and wheel in assembled relation.

Fig. 4 is a detail cross-sectional View on the lines 4-4 of Fig. 1.

more particularly concerned on lines 9-9 of Fig. 7,

v resilient sheet metal Fig. 5 is a detail View of'our abrasive disk with its backing, sheet partially broken away.

a modified form of supporting wheel.

Fig. 7 is a sectional rear view of another Fig. 6 is a medial cross-sectional view of modification taken along line 77 of Fig. 8.

Fig. 8 is a medial cross section of this embodimenttaken along lines 8-8 of Fig. 7.

Fig. 9is a cross section of this embodiment illustrating the means for securing the hub to the wheel.

Referring to Fig. 2, 10 indicates in its entirety our supporting wheel and 11 in its entirety our abrasive disk adapted to be carried thereby. The abrasive disk 11 comprises a substantially flat sheet 12 'ofemery cloth, emery paper, sand paper, or the like, preferably circular in form and adapted to be removably clamped upon the supporting wheel 10. a Y

The abrasive disk 11 is provided with a sheet metal plate 13 (Fig. 5) having a plurality of tabs 14 punched out of said plate and the tabs 14 are preferably formed with a rounded end 15 for convenience in guiding them intothe slot and to eliminate any sharp corners. The sheet metal plate 13' with its tabs '14 may bemade. of ordinary tin formed with the tabs projecting at substantially right angles as at Fig. 2, or of which case the tabs are preferably given a slight slant as shown in Fig. 5. 1 The method of attachment'in either'case is substantially the same except, that the tin tabs may be bent over retaining their bent position while the resilient tabs are preferably retained in bent position by a clamping member further to be described. The clampingmember may be employed in either case in order to securely clamp the abrasive disk upon the supporting wheel 10. i

The sheet metal plate 13 is preferably located centrally upon the rear .side of the abrasive sheet 12 with its tabs projecting rearwardly and the sheet metal plate may be secured upon the abrasive sheet in many different Ways. A convenient and effective method of securing the metal plate upon the abrasive sheet is to provide a backing sheet 16 having a plurality of slits 17 located to receive the tabs the backing sheet may be secured-upon the such as springbrass in 14 of the metal plate and abrasive sheet with any type of glueorceparts.

a of the'tabs slits 24.

Eufiicient width to support the pad 26 en-' preferably provided with a flange 20 ment, preferably some adhesive which is not affected by the heat generated during the use of the abrasive disk.

When the sheets 12 and 16 are severely joined by such an adhesive from the edge of the metal plate13 to the outer ed e of the sheets, the metal plate is securely xed between the two sheets and the tabs 14 may be employed for fixing the abrasive sheet upon'a supporting wheel. l n order to make the connection between the metal plate and abrasive disk more durable, cement may also be used between the metal plate 13 and the back of the abrasive sheet 12 and between the metal plate '13 and the bacln'ng sheet 16.

' The slits 17 as well as the tabs 14 preferably extend radially in order that the tabs may bear against an elongated edge of the slit to increase the bearing surface between I these parts in the direction of the rotative forces. However, many of the advantages of ourinvention may be realized by having the slits and tabs extend in other directions.

The supporting wheel 10 comprises a stamped sheet metal disk or wheel 18 of substantially' cup shape and having a central flanged aperture 19. The aperture 19 is of substantially cylindrical shape extending to the top of the cup and with a frusto-comcal flange 21 extending from the flange 20 to the bottom of the cup. The frustro-conical flange 21 forms a counter sunk portion 22 of the a erture 19 which enables the attachment 0 a hub 23 without any projecting The disk 18 is also provided with a plurality of radially extendingslits 24 of sufli'cient length to receive the tabs 14 on the abrasive disk ll'and located so that all register simultaneously with the The disk 18 is also-provided with an annular flan e 25 which may be of sufiicient width to form a support for a pad 26, or which may be employed with an auxiliary sheet metal plate'27 to support said'pad. V

In the embodiment shown in Fig. 2,,the

' supporting wheel comprises a cup shaped disk 20 and the sheet metal plate 27 which is riveted thereto by a plurality of rivets 28. The sheet metal plate 27 is a substantially circular plate of metal, preferably of steel, having a centrally located circular aperture 29 which is adapted to fit about the wall 30 of the cup shaped disk 18 so that the flange 25 and sheet metal plate 27 may be riveted together. The provision of a sheet metal late 27 instead of forming the flange 25 of ables the use of a single size of cup shaped disk with a pluralit of different plates 27 to form wheels of di erent diameters, but we desire it to be understood that these parts may be made integral as shown 1n Fig, 6.

pad 26 and riveted over small washers 33.

The washers should preferably be riveted down into the felt pad compressing the pad about the'rivet so that the topof the rivet is flush with the surface of the pad or below the same and the pad has no prqecting parts.

The hub 23 comprises a tubular member preferably formed of steel which is internally threaded as at 34 for the reception of the threaded end 35 of'an arbor 36 which is adapted to rotate the abrasive wheel. The hub 23 is also provided with an externally threaded surface 37 adapted to receive an internally threaded clamping member 38, and the hub 23 is originally formed as shown in Fig. 2 with a reduced end 39 of substantially cy' indrical form adapted to fit within the aperture 19. The reduced end forms an annular shoulder 40which may bear against the upper edge of the annular flange 20, and the lower edge 41 of the hub may be spun outward within the counter sunk aperture 22 to the dotted line position shown in Fig. 2, thereby permanently assembling these parts together. The cup shaped disk 18 will then be firmly held upon the hub being engaged between theshoulder 40 and the outwardly s un frustro-conical flange 42 as shown in ig. 6.

The clamping member 38 comprises a substantially cylindrical metal member, preferably of steel, having a cent-rally located bore 43 adapted to pass the arbor 36 and its threaded end 35, and having a threaded counter bore 44 which is complementary to the threadedportion 37 of the hub. The clamping member may be provided with an enlarged counter bore 45 communicating with the threaded counter bore 44 by a frustro-conical surface 46 in order that the lower portion of the aperture in the clamping member may be of sufficient size to receive the flanges 20 and 21 about the hub. The clamping member 38 is also provided with an annular flange 47 projecting from its lower end at substantially right angles to the axis of the bores andforming a lower smooth clamping surface 48 having a substantially circularboundary 49.

The flange 47 is adapted to fit within the shown in Fig. 9.,

member 38 threaded upon the against the wheel the member from its cylindrical outer surface in a direction at right angles to the axis of the bores, for the reception of a peg or other form of tighteningwrench.

' In the modification shown in Fig. 6 the flanges 25 of the cup shaped disk 18 is. of suflicient width to support the pad 26 without an auxiliary sheet metal plate 27. The other details of these two devices may be exactly the same. p

In the modification shown in Figs. 7, 8 and 9, the hub 23' by a riveted flange 51 instead of by a frustro-conical flange and the clampin member 38 is entirely dispensed with. The wheel 18 is provided with a central aperture 19 which snugly, fits the end of the hub 52. The hub is rovided with a star shaped flange 51, as s own in Fig. 7, so that it may be secured to the wheel by rivets 53 without interfering with, the slots 24. This isclearly The operation and assembly of the abrasive wheel and disk illustrated in Figs. 1 to 6 is as follows. The clam ing member 38 is first placed upon an ar or 36 with the flange 47 toward the outer end of the arbor, after which the hub 23 of the wheel may be threaded upon .the threaded end 35 of the arbor to the 'end of the thread where these two parts become fixed together. The wheel may then be provided. with an abrasive disk of the form shown in Figs. 2 or 5, the tabs 14 being passed through the slots 24 in the wheel. The tabs 14 maythen be bent over on the other side of the slots within the annular space 50 and the clam ing 'hub unti the surface 48 clamps the ends of the tabs 14 against the bottom of the cup.

Another method of attachment where the tabs 14 are resilient would be to pass the tabs through the slits 24 and pressing upon the. abrasive disk so as to hold it tightly clamping member38 may be threaded home the flange 47 will bend the tabs 14 over, clamping these tabs in the-same way.

The operation of the modification shown in Figs. 7 to 9 is still more simple. In this case the tabs 14 are of heavier metal than in the former case and they do not require a clamping means. Heavy-tin tabs inserted through the slots and bent over will hold the disk securely without the clamping device. tain this bent position are held in place by the rotation of the wheel; the

wheel in rotating causes the edges of the slot to exert force against the slanting tabs, and one component of this force tends to hold the disk on the wheel.

While the preferred embodiment has been described as using metal tabs, it is understood that any material may be .used which gaging the slots of is secured to the wheel in such manner that through said 'cup and spun Tabs of material too resilient to re'-- has the necessary physical properties. Sheets of cellulose compounds, condensation products, fiber compositions, etc., may be used instead of sheet metal ,as lon "as the tabs punched from these sheets are rlgid and strong enough to hold the disks in place. Also the backing pa er itself may be made of a sheet of strong ber composition or the like and may be provided with tabs for enthe support, thuselimihating the metal sheet altogether. other modifications will be evident to skilled in the artwithout the spirit of our invention.

It will be observed that we have provided an abrasive disk, and a novel supportin wheel, these parts havin a simple and e fective means for removaily su porting the Our :1 rasive disk minimum expendithose departing from disk upon the wheel.

may be removed with a ture of time and labor, our supporting means the central. portion of the disk is preserved for grinding at relatively low speeds. The clampin member 38 cannot become lost or detach because when it is not in clamping relation it is retained loosely upon the arbor 36. If desired the clamping member 38 may be provided with an exterior surface which is noncircular, such as hexagonal, to-receive an ordinary wrench instead of having the bore 51. hile we have illustratedand described a specific embodiment of our invention, many modifications may be made without departing from the spirit of the invention, and we do not wish'to be limited to the recise details of construction set forth, but desire to avail ourselves of all changes within the scope of the a pended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

Many

and by the use of 1. In an abrasive device, the combination of a sheet metal wheel having a cup formed therein, an annular pad carried by said wheel flush with the outside of said cup, said on having a plurality of radial slots, and a tu ular hub having a reduced, end passing cure the same to said disk.

2. In an abrasive device, the combination of a sheet metal wheel having a cup formed therein, an annular pad carried by said disk flush with the outside of said cup, said cup having a plurality of radial slots, and a tubular hub having a reduced end passing through said cup and spun outwardly to secure the same to said disk, said hub being threaded to receive a clamping member comprising an internall threaded sleeve with an annular flange receivable in said cup.

3. In an abrasive device, the combination of a sheet metal disk having a flanged counter-sunk a erture at its center, a felt pad carried by sai disk, and a hub comprising outwardly to sea sleeve having a reduced end to be received in said aperture, said. end being spun outward in said counter-sunk aperture.

4. In an abrasive device, the combination of a sheet metal disk having a flanged coun ter-sunk aperture at its center, a felt padcarried by said disk, a hub comprising a sleeve having a reduced end to be received in said aperture, said end being spun outward 1n said counter-sunk aperture, said disk 5. In combination a wheel provided with 15 a cup shaped disk having radial slots, an annular flange on said disk, a supporting pad on said flange, an abrasive disk adapted to fit against said supporting pad, tabs extending from the baek'of said disk and spaced to 20 register in said slots whereby the abrasive disk may easily be put on or removed.

In witness whereof, we hereunto subscribe. our names this 6 dayof August, 1927.

having a plurality of slots for receiving projecting tabs of an abrasive member, and a clampmg member threaded on said hub to clamp said tabs.

FRANS o. ALBERTSON;

GUSTAV OLSEN. 

